1 files changed, 58 insertions, 0 deletions
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 6cc4704190fd..da8577fb3d07 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -11,9 +11,20 @@
  */
 
 #include <linux/if_bridge.h>
+#include <linux/notifier.h>
 
 #include "dsa_priv.h"
 
+static int dsa_port_notify(struct dsa_port *dp, unsigned long e, void *v)
+{
+	struct raw_notifier_head *nh = &dp->ds->dst->nh;
+	int err;
+
+	err = raw_notifier_call_chain(nh, e, v);
+
+	return notifier_to_errno(err);
+}
+
 int dsa_port_set_state(struct dsa_port *dp, u8 state,
 		       struct switchdev_trans *trans)
 {
@@ -53,3 +64,50 @@ void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
 	if (err)
 		pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
 }
+
+int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
+{
+	struct dsa_notifier_bridge_info info = {
+		.sw_index = dp->ds->index,
+		.port = dp->index,
+		.br = br,
+	};
+	int err;
+
+	/* Here the port is already bridged. Reflect the current configuration
+	 * so that drivers can program their chips accordingly.
+	 */
+	dp->bridge_dev = br;
+
+	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
+
+	/* The bridging is rolled back on error */
+	if (err)
+		dp->bridge_dev = NULL;
+
+	return err;
+}
+
+void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
+{
+	struct dsa_notifier_bridge_info info = {
+		.sw_index = dp->ds->index,
+		.port = dp->index,
+		.br = br,
+	};
+	int err;
+
+	/* Here the port is already unbridged. Reflect the current configuration
+	 * so that drivers can program their chips accordingly.
+	 */
+	dp->bridge_dev = NULL;
+
+	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
+	if (err)
+		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
+
+	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
+	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
+	 */
+	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
+}